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Thread: Blue, red, green or yellow densitometer channel?

  1. #1
    Scott Hannaford
    Join Date
    Sep 2008
    Location
    Canberra, Australia
    Posts
    33

    Blue, red, green or yellow densitometer channel?

    Hi all - trying to use an old densitometer to read my delta 100 negs, and not sure which colour to use. It has a dial on the front with four colours, red, blue, green and yellow, but no 'visual' cahnnel. I'm guessing yellow might be the visual channel, but only guessing. Any thoughts? (it's an old orange unit, Rollie 401T, or Rollmat or something like that).
    Thanks

  2. #2

    Re: Blue, red, green or yellow densitometer channel?

    Most of the darkroom materials, i.e. paper etc. are sensitive to blue, so use the blue channel.

    //Björn

  3. #3
    ic-racer's Avatar
    Join Date
    Feb 2007
    Posts
    3,851

    Re: Blue, red, green or yellow densitometer channel?

    If I had that unit I would just take the filter out of the yellow channel (save it) and use that channel as the white channel.

    Not sure about your machine, but on mine, the only difference between the color channels is the presence of a filter between the sensor and the film. In "white" mode the filters are removed.

  4. #4
    Big Negs Rock!
    Join Date
    Mar 2000
    Location
    Pasadena
    Posts
    1,079

    Re: Blue, red, green or yellow densitometer channel?

    I believe Kodak recommends using the Blue sensor. It's what I use.

    MW
    Mark Woods

    Large Format B&W
    Cinematography Mentor at the American Film Institute
    Past President of the Pasadena Society of Artists
    Director of Photography
    Pasadena, CA
    www.markwoods.com

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